/***************************************************************************************************************************************************/

/*******************                           情况 1,2,3   之情况1（单向）       ------- 【让Product做主表去参照Dividend】

/***************************************************************************************************************************************************/


即：由


//我们发现是product参照dividend表。所以这里product是主表。set的时候要用 product.setDividend(dividend);

@Entity
@Table(name="wxsc_product")
public class Product extends EntitySupport{

	@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
	@JoinColumn(name="dividend_id",referencedColumnName="id")
	private Dividend dividend;//赠品



@Entity
@Table(name="wxsc_dividend")
public class Dividend extends EntitySupport {

	@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY,mappedBy="dividend")
	private Product product;



以及：
Dividend dividend = new Dividend();
		dividend.setAttribute("玩具类");
		//dividend.setDividendId("DJFOIWEFILDJFOWFEjo-DJFWOE");
		dividend.setDividendName("赠品:自行车");
		dividend.setDividendNumber("484545488");
		dividend.setQuantity(2);
		dividend.setCreateTime(date);
		dividend.setUpdateTime(date);
	
	//下面让这两个商品p1,p2都赠送这一个赠品,另外一个商品p3则没有赠品
	Product p1 = new Product();
		p1.setArticleNumber("03558866-24-22");
		p1.setProductAttribute("湖南纸业出品");
		p1.setProductName("卫生纸");
		p1.setUnitPrice(14.32d);
		p1.setCreateTime(date);
		p1.setUpdateTime(date);
		p1.setDividend(dividend);
	Product p2 = new Product();
		p2.setArticleNumber("0694412548522");
		p2.setProductAttribute("广东阳江");
		p2.setProductName("水果刀");
		p2.setUnitPrice(6.5d);
		p2.setCreateTime(date);
		p2.setUpdateTime(date);
		p2.setDividend(dividend);
	
	Product p3 = new Product();
		p3.setArticleNumber("8754515484522");
		p3.setProductAttribute("广州经济开发区");
		p3.setProductName("茉莉蜜茶");
		p3.setUnitPrice(3.0d);
		p3.setCreateTime(date);
		p3.setUpdateTime(date);
		p3.setDividend(null);
	this.merge(p1);
	this.merge(p2);
	this.merge(p3);

生成的表关系是：


mysql> show create table wxsc_product;
+--------------+---------------------------------------------------------------------------------
| Table        | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
+--------------+---------------------------------------------------------------------------------
| wxsc_product | CREATE TABLE `wxsc_product` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `createTime` datetime NOT NULL,
  `updateTime` datetime NOT NULL,
  `version` int(11) NOT NULL,
  `article_number` varchar(255) DEFAULT NULL,
  `order_quantity` int(11) DEFAULT NULL,
  `product_attribute` varchar(255) DEFAULT NULL,
  `product_name` varchar(255) DEFAULT NULL,
  `unit_price` double DEFAULT NULL,
  `dividend_id` bigint(20) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FKEC59DBA19367CD45` (`dividend_id`),
  CONSTRAINT `FKEC59DBA19367CD45` FOREIGN KEY (`dividend_id`) REFERENCES `wxsc_dividend` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=gbk |
+--------------+----------------------------------------------------------------------------------
1 row in set (0.00 sec)

mysql> show create table wxsc_dividend;
+---------------+---------------------------------------------------------------------------------
| Table         | Create Table